Abstract
Genetic parameters were estimated, using the restricted maximum likelihood method, for 1112 open-pollinated progenies of Pinuscontorta Dougl. ex Loud. var. latifolia Engelm. plus trees selected from among 83 undisturbed stands in the interior of the Yukon and British Columbia, and five similar stands in Alberta. The progenies were grown in Swedish test plantations. Tree condition, height, and ramicorn whorl frequency were assessed at ages ranging between 8 and 12 years. On the harshest sites, weather and fungal damage, e.g., caused by Gremmeniellaabietina (Lagerb.) Morelet, were also assessed. Categorical data were transformed into values on a normal score scale to improve the efficiency of the evaluation. The genetic coefficients of variation in tree height ranged between 8 and 17%. The heritabilities for tree height, including stand genetic variation, were estimated to range between 0.10 and 0.54. Genetic correlations between tree height and trunk leaning were usually high and positive, as were correlations between height and ramicorn whorl frequency. At one site, heritability estimates for trunk injury and (or) canker and fungal and (or) weather damage were 0.12 and 0.18, respectively.
Published Version
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